Summary of Ambient Air Monitoring (Summer)
from 2001 to 2009
|
Parameters
|
Hong Kong Air Quality Objective | Baseline | Monitoring Results | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1992 |
2001
|
2002
|
2003
|
2004
|
2005
|
2006
|
2007
|
2008
|
2009
|
||||
| 24 hr. Average | Sep |
Aug
|
Aug
|
Jul
|
Jul
|
Jul
|
Jul | Jul | Jul | Jul | |||
| Sulphur Dioxide (SO2) ug/m3 |
350
|
5.0-19
|
2.6-3
|
2.6-6
|
2.6-3
|
2.6-3
|
2.6-4.1
|
6.3-7.4
|
2.6-6.5
|
4.1-12.4
|
7.0-22.1
|
||
| Nitrogen Dioxide (NO2) ug/m3 |
150
|
21-46
|
10-36
|
12-26
|
5-10
|
5-7
|
12.4-31.5
|
45.1-58.8 | 12.3-21.2 |
40.5-53.4
|
27.5-70.2 | ||
| Total Suspended Particulates (TSP) ug/m3 |
260
|
38-52
|
41-95
|
27-59
|
19-45
|
31-81
|
31-47
|
38-87 | 32-53 |
27-70
|
31-44 | ||
| Respirable Suspended Particulates (RSP) ug/m3 |
180
|
23-27
|
31-76
|
14-41
|
15-30
|
24-63
|
25-38
|
29-71 | 26-45 |
19-39
|
21-32 | ||
| Nitrogen Oxides (NOx) ug/m3 |
---
|
33-90
|
33-65
|
22-80
|
10-31
|
9-16
|
37.8-102.0
|
86.0-133.8 | 33.5-110.6 |
65.7-128.5
|
37.5-109.7 | ||
| Non-methane Hydrocarbons (NMHC) mg/m3 |
---
|
<0.1-1.3
|
0.47-1.03
|
0.66-1.05
|
0.74-1.63
|
1.29-2.16
|
0.85-1.42
|
2.72-3.95 | 0.53-1.15 |
0.40-1.15
|
0.44-0.67 | ||
| PCBs (total) ng/m3 |
---
|
3
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil
|
Nil | ||
| Dioxins (total) pg/m3 |
---
|
0.084
|
0.039
|
0.037
|
0.037
|
0.038
|
0.038
|
0.038
|
0.037 | 0.040 | 0.038 | ||
| VOCs (total) ug/m3 |
---
|
104.1
|
14.4
|
15.79
|
33.69
|
145.67
|
81.9
|
28.49 | Nil |
12.89
|
258.0 | ||
| Prevailing Wind Direction |
---
|
South- west
|
North- east
|
North- east
|
South
|
South
|
North- east | South- east | South- west |
South- west
|
South- west | ||
Remarks :
-Meteorological data were obtained on the roof of Technical building at CWTC.
-The Total 2,3,7,8-TCDD Toxicity Equivalence is the product sum of the concentration of all seventeen 2,3,7,8-substituted PCDDs/PCDFs congeners and their respective Toxicity Equivalence Factor (TEF). For those congeners with concentration found below the MDL, half MDL is used for calculation.
